1 cup coarse fresh bread crumbs (from 2 slices firm sandwich bread)
1/4 teaspoon salt
1/4 cup plus 1 tablespoon extra-virgin olive oil
1 large head cauliflower (2 1/2 lb), cut into 1-inch-wide florets (8 cups)
1/4 lb sliced pancetta, chopped (1 cup)
4 garlic cloves, finely chopped
1/4 teaspoon dried hot red pepper flakes
1 1/2 cups reduced-sodium chicken broth
3/4 lb dried whole-wheat linguine
1/2 oz finely grated Parmigiano-Reggiano (1/4 cup) plus additional for serving
1/3 cup chopped fresh flat-leaf parsley